The Ordnance Survey benchmarks chiselled into buildings, walls and bridges were originally used to measure height across ...

Full descriptions of other Ordnance Survey maps, with illustrations and indexes, are given in two pamphlets, one dealing with small-scale maps and the other large-scale maps, issued by the ...

More information about the Center surveys cited in this analysis can be found at the links in the text. Here is the question used in the January 2025 survey, the topline and the survey methodology.